<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Title</title>
</head>
<body>


<script src="../js/vue.js"></script>
<div id="app">
  <label for="male">
    <input type="radio" value="male" id="male" name="sex" v-model="sex">男

  </label>
  <label for="female">
    <input type="radio" value="female" id="female" name="sex" v-model="sex">女
  </label>
</div>

<script>
  const app = new Vue({
    el: '#app',
    data: {
      message: "第一次，系统的学VUE",
      sex:'male'
    }
  })
</script>
</body>
</html>